<template>
    <el-container class="home-container">
        <!--        头部区域-->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!--        内容区域-->
        <el-container>
            <!--            侧边栏-->
            <el-aside :width="isCollapse ? '61px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!--                侧边栏菜单区-->
                <el-menu
                        background-color="#333744"
                        text-color="#fff"
                        active-text-color="skyblue"
                        :unique-opened="true"
                        :collapse="isCollapse"
                        :collapse-transition="false"
                        :router="true"
                        :default-active="activePath">
                    <!--                    一级菜单-->
                    <!--                    index的值需要的是字符串-->
                    <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
                        <!--                        一级菜单模板区-->
                        <template slot="title">
                            <!--                            图标-->
                            <i :class="iconsObj[item.id]"></i>
                            <!--                            文本-->
                            <span>{{item.authName}}</span>
                        </template>
                        <!--                        二级菜单-->
                        <!--                        二级路由跳转位置-->
                        <el-menu-item :index=" '/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                            <template slot="title">
                                <!--                            图标-->
                                <i class="el-icon-menu"></i>
                                <!--                            文本-->
                                <span>{{subItem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!--            主题区域-->
            <el-main>
                <!--                路由占位符-->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
    export default {
        data() {
            return {
                // 左侧菜单数据
                menuList: [],
                // 一级菜单图标对象
                iconsObj: {
                    '125': 'iconfont icon-user',
                    '103': 'iconfont icon-tijikongjian',
                    '101': 'iconfont icon-shangpin',
                    '102': 'iconfont icon-danju',
                    '145': 'iconfont icon-baobiao',
                },
                // 控制菜单是否展开
                isCollapse: false,
                // 被激活的链接地址
                activePath: '',
            }
        },
        created() {
            this.getMenuList()
            this.getNavState()
        },
        methods: {
            logout() {
                window.sessionStorage.clear();
                this.$router.push('/login');
            },
            // 获取所有菜单
            async getMenuList() {
                const {data: res} = await this.$http.get('menus')
                if (res.meta.status !== 200) return this.$message.error(res.meta.msg);
                this.menuList = res.data;
            },
            // 点击按钮 切换菜单的折叠与展开
            toggleCollapse() {
                this.isCollapse = !this.isCollapse;
            },
            //保存链接的激活状态
            saveNavState(activePath) {
                window.sessionStorage.setItem('activePath',activePath)
                //确保第二次点击时保存状态
                this.activePath = activePath
            },
            //获取链接的激活状态
            getNavState() {
                const activePath = window.sessionStorage.getItem('activePath');
                this.activePath = activePath;
            }
        }
    };
</script>

<style lang="less" scoped>
    .home-container {
        height: 100%;
    }

    .el-header {
        background-color: #373d41;
        display: flex;
        justify-content: space-between;
        padding-left: 0;
        align-items: center;
        color: #ffffff;
        font-size: 20px;

    > div {
        display: flex;
        align-items: center;

    span {
        margin-left: 15px;
    }

    }
    }

    .el-aside {
        background-color: #333744;

    .el-menu {
        border-right: none;
    }

    }

    .el-main {
        background-color: #EAEDF1;
    }

    .iconfont {
        margin-right: 10px;
    }

    .toggle-button {
        background-color: #4a5064;
        font-size: 10px;
        line-height: 24px;
        color: #ffffff;
        text-align: center;
        letter-spacing: 0.2em;
        cursor: pointer;
    }
</style>
